Tag: asexual and sexual reproduction in plants

Questions Related to asexual and sexual reproduction in plants

The condition of maturation of anthers and stigmas of the same flower simultaneously is

self pollination asexual and sexual reproduction in plants botany

  1. Xenogamy

  2. Geitonogamy

  3. Allogamy

  4. Homogamy

Show answer
Correct Option: D
Explanation:

Geitonogamy: The transfer of pollen grains from the anther of a flower to the stigma of another flower borne by the same plant.

Xenogamy: Transfer of pollen grains from the anther of a flower to the stigma of another flower borne on a different plant but belonging to the same species.

Allogamy is the deposition of pollen grains from the anther of the one flower on the stigma of another flower, either in the same plant or in a different plant of the same species.

Homogamy: It is the condition in which flowers are bisexual anther and stigma mature at the same time to make self-pollination possible. Under this condition, the stigma receives the pollen grains from the anthers of the same flower by the agency of wind or insects.

 So, the correct answer is D.

What is pre-requisite for self pollination?

self pollination asexual and sexual reproduction in plants botany

  1. Chasmogamy

  2. Homogamy

  3. Absence of pollenkitt

  4. Absence of nectar

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Correct Option: A

The condition of maturation of stigma before anthers of the same flower is

self pollination asexual and sexual reproduction in plants botany

  1. Protandry

  2. Herkogamy

  3. Protogyny

  4. Prepotency

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Correct Option: C

Assertion (A):  Self ineompatibility is not an absolute phenomenon.
Reason (R): Even highly self-incompatible species can be self-pollinated by one stratagem or another.

self pollination asexual and sexual reproduction in plants botany

  1. Both A and Rare individually true and R is the correct explanation of A

  2. Both A and Rare individually true and R is not the correct explanation of A

  3. A is true but R is false

  4. A is false but R is true Assertion

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Correct Option: A

Consider the following with reference to sporophytic (SSI) or gametophytic (GSI) self-incompatibility systems:
1. SSI-3 celled pollen, rejection reaction on the stigma
2. GSI -2 celled pollen, rejection reaction in the style. SSI -2 called pollen, rejection reaction in the style.
3. GSI- 3 celled pollen, rejection reaction on the stigma
Which of these features are correct in the case of sporophytic gametophytic self- incompatibility systems?

self pollination asexual and sexual reproduction in plants botany

  1. 1 and 2

  2. 2 and 3

  3. 2 and 4

  4. 3 and 4

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Correct Option: A

Cleistogamy is found in _____________.

self pollination asexual and sexual reproduction in plants botany

  1. Ficus

  2. Commelina

  3. Vallisnerea

  4. Anthocephalus

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Correct Option: A

The nucellus of the ovule is:

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. haploid

  2. diploid

  3. triploid

  4. polyploidy

Show answer
Correct Option: B
Explanation:

In seed plants, Ovule is the part of the female reproductive organ. It consists of three parts; Integument ( forming its outer layer) Embryo sac ( female gametophyte) and a Nucellus that is the central and largest part of the ovule as a source of nutrients for the embryo and its ploidy is diploid i.e 2n
Nucellus is derived from the apical portion of the ovule primordium of the ovule primordium and function as a megasporangium i.e, the nucellus produces the megasporocyte, which will undergo meiosis to form megaspores that is the reason that nucellus of the ovule is diploid in nature.
So, the nucellus of ovule is diploid.

So, the correct answer is 'diploid'.

In Angiosperms, the common type of ovule is __________.

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Anatropous

  2. Orthotropous

  3. Hemi anatropous

  4. Campylotropous

Show answer
Correct Option: A
Explanation:
In Angiosperms, the most common type of ovule is anatropous or inverted ovule, where the micropyle is adjacent to the funicle
So, the correct answer is 'Anatropous'

Ovule represents

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. Microsporangium

  2. Megasporangium

  3. Gametophyte

  4. Embryo.

Show answer
Correct Option: B
Explanation:
 Microsporangium  Pollen grains or male gamete
 Megasporangium  Ovules or female gamete
 Gametophyte  Sexual phase in the life cycle of the plant
 Embryo  Part of a seed, which is formed after fertilization

So, the correct answer is 'Megasporangium'

An angiospermic plant has to produce $88$ viable embryo sacs. How many meiotic divisions will be needed to produce equal number of female gametophytes by this plant?

botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

  1. $88$

  2. $22$

  3. $44$

  4. $132$

Show answer
Correct Option: A
Explanation:
Ovule contains the female gametophyte or the embryo sac. Each ovule usually contains only one embryo sac
Each embryo sac is formed by meiotic division of the diploid mother cell
The end result of a meiotic division is 4 haploid cells, in most cases, of the 4 haploid cells formed, three degenerate and  one develops into the embryo sac 
Therefore, to produce 88 viable embryo sacs 88 meiotic divisions are required
So, the correct answer is '88'